[1]张光宇,刘琳婧. La位Y掺杂对亚锰酸盐La0. 7 Sr0. 3 MnO3低场磁电阻影响[J].哈尔滨理工大学学报,2019,(02):144-148.[doi:10.15938/j.jhust.2019.02.022]
 ZHANG Guang yu,LIU Lin jing.Effect of Y Doping in La Site on Low Field Magnetoresistance of ManganiteLa0. 7 Sr0. 3 MnO3[J].哈尔滨理工大学学报,2019,(02):144-148.[doi:10.15938/j.jhust.2019.02.022]
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 La位Y掺杂对亚锰酸盐La0. 7 Sr0. 3 MnO3低场磁电阻影响()
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《哈尔滨理工大学学报》[ISSN:1007-2683/CN:23-1404/N]

卷:
期数:
2019年02期
页码:
144-148
栏目:
数理科学
出版日期:
2019-04-25

文章信息/Info

Title:
Effect of Y Doping in La Site on Low Field Magnetoresistance of ManganiteLa0. 7 Sr0. 3 MnO3
文章编号:
1007-2683(2019)02-0144-05
作者:
 张光宇刘琳婧
 (哈尔滨理工大学 应用科学学院,黑龙江 哈尔滨 150080)
Author(s):
 ZHANG GuangyuLIU Linjing
 (School of Applied Science, Harbin University of Science and Technology, Harbin 150080, China)
关键词:
 亚锰酸盐固相反应掺杂低场磁电阻
Keywords:
 manganite solidstate reaction doping low field magnetoresistance
分类号:
O482
DOI:
10.15938/j.jhust.2019.02.022
文献标志码:
A
摘要:
针对钙钛矿亚锰酸盐在较低磁场下的磁电阻效应,采用固相反应法制备了亚锰酸盐多晶样品 La0. 7 - xYxSr0. 3MnO3 ( x = 0,0. 1,0. 2) ,测量了两个样品( x = 0,0. 2) 的 X 射线衍射谱及 3 个样品( x = 0,0. 1,0. 2) 在未加磁场和加 0. 25 T 磁场的电阻 - 温度( R-T) 曲线和磁电阻 - 温度( MRT) 曲线,分析了 La 位 Y 掺杂对样品低场磁电阻效应的影响。实验结果表明,样品 La0. 7 Sr0. 3MnO3的晶体结构由立方结构向四方结构畸变,样品 La0. 5Y0. 2 Sr0. 3MnO3为立方结构。随着 La 位 Y 掺杂量从 x = 0 增加到 x = 0. 2,晶格常数减小。在实验温区内,3 个样品的 R-T 曲线没有出现金属 - 绝缘体转变峰,呈现出金属电阻温度特性。在相同的温度下,3 个样品在加磁场时的电阻比未加磁场时的电阻要小,表现为负磁电阻。3 个样品的 MR-T 曲线没有出现峰值温度 TP,磁电阻的大小随温度的降低而增加。在 0. 25 T 磁场下,3 个样品在实验温区都具有明显的低场磁电阻效应。为钙钛矿亚锰酸盐在磁电子学领域的应用研究提供了重要参考。
Abstract:
 In view of magnetoresistance effect of perovskite manganite in low magnetic field,manganite polycrystalline samples La0. 7 - xYxSr0. 3MnO3 ( x = 0,0. 1,0. 2) were prepared by solid-state reaction technique. Xray diffraction spectrums of the two samples ( x = 0,0. 2 ) and resistance-temperature ( R-T ) curves and magnetoresistance-temperature ( MR-T) curves of the three samples ( x = 0,0. 1,0. 2) in zero magnetic field and 0. 25 T magnetic field were measured. Influence of different substitution of Y for La on low field magnetoresistance effect of the samples was analyzed. Experimental results showed that the crystal structure of the sample La0. 7 Sr0. 3 MnO3 was distorted from cubic structure to tetragonal structure and that of the sample La0. 5Y0. 2 Sr0. 3MnO3 was cubic structure. The lattice constants decreased with the increase of Y doping in La site from x = 0 to x = 0. 2. The R-T curves of the three samples did not appear the metal-insulator transition peak in the experimental temperaturerange,showing the metal resistance   temperature  characteristics. At the same temperature,the resistance of the three samples in magnetic field was smaller than that in zero magnetic field, showing the negative magnetoresistance. The MR-T curves of the three samples showed no peak temperature TP and the magnetoresistance increased with decreasing temperature. The three samples showed obvious low field magnetoresistance effect in the experimental temperature range in 0. 25 T magnetic field. This paper provided an important reference for application research of perovskite manganite in the field of magnetoelectronics.

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备注/Memo

备注/Memo:
 收稿日期:2017-01-09
基金项目:黑龙江省自然科学基金(F200831);黑龙江省大学生创新创业训练计划项目(201510214050)
作者简介:
刘琳婧(1994—),女,硕士研究生
通信作者:
张光宇(1971—),男,博士,教授,E-mail:guangyuzhang@163.com
更新日期/Last Update: 2019-05-17